PURB-HOTAIR复合体调节了p53依赖的促进体特异性转录激活
Zhangchuan Xia1, Ning Kon1, Zhenyi Su1
1Institute for Cancer Genetics, Herbert Irving Comprehensive Cancer Center, Vagelos College of Physicians and Surgeons, Columbia University Irving Medical Center, New York, NY, USA.
Nature structural & molecular biology
|June 25, 2025
概括
研究人员发现了富含纯素的元素结合蛋白B (PURB) 作为一种新的p53核心压缩剂. 这种蛋白质与HOTAIR lncRNA和EZH2一起,调解促进器特异的p53转录抑制,为癌症调控提供了新的见解.
科学领域:
- 分子生物学分子生物学
- 癌症研究 癌症研究
- 表观遗传学 在表观遗传学中,表观遗传学是指表观遗传学.
背景情况:
- 通过各种转录标,p53蛋白调节各种细胞功能.
- 对于p53对促进体特异性调节的精确机制,人们还没有完全理解.
- 了解这些机制对于癌症研究和治疗开发至关重要.
研究的目的:
- 为了确定p53转录活性的新型调节剂.
- 通过p53.3阐明促进体特异调节的机制.
- 研究PURB和HOTAIR在p53介导基因表达中的作用.
主要方法:
- 生物化学净化以识别相互作用的蛋白质.
- Knockdown 实验用于评估基因表达变化.
- 对DNA结合元素和蛋白质-RNA相互作用的分析.
- 染色体免疫沉研究蛋白质招募到促进体.
主要成果:
- 鉴定出富含纯素元素结合蛋白B (PURB) 是一个p53核心压缩剂.
- PURB的核心抑制活性取决于p53的乙化状态.
- PURB将一个独特的元素与p21促进体结合,并且需要HOTAIR lncRNA进行抑制.
- 在PURB-HOTAIR复合物促进p53招募EZH2进行转录抑制.
结论:
- 建立了一种新的lncRNA介导的p53转录的序列特定调节机制.
- 通过PURB-HOTAIR-EZH2复合体调节p53的乙化依赖的,促进体特异性调节.
- 在癌症中PURB过度表达表明其作为治疗点的潜在作用.
相关概念视频
Abnormal Proliferation
4.6K
Under normal conditions, most adult cells remain in a non-proliferative state unless stimulated by internal or external factors to replace lost cells. Abnormal cell proliferation is a condition in which the cell's growth exceeds and is uncoordinated with normal cells. In such situations, cell division persists in the same excessive manner even after cessation of the stimuli, leading to persistent tumors. The tumor arises from the damaged cells that replicate to pass the damage to the...
4.6K
Co-activators and Co-repressors
7.5K
Gene transcription is regulated by the synergistic action of several proteins that form a complex at a gene regulatory site. This is observed in eukaryotes, where the regulation of gene expression is a complex process. Regulatory proteins in eukaryotes can broadly be classified into two types – regulators that bind directly to specific DNA sequences and co-regulators that associate with regulatory proteins but cannot directly bind to the DNA. These co-regulators are further divided into...
7.5K
The Eukaryotic Promoter Region
16.6K
The eukaryotic promoter region is a segment of DNA located upstream of a gene. It contains an RNA polymerase binding site, a transcription start site, and several cis-regulatory sequences. The proximal promoter region is located in the vicinity of the gene and has cis-regulatory sequences and the core promoter. The core promoter is the binding site for RNA polymerase and is usually located between -35 and +35 nucleotides from the transcription start site. The distal promoter regions are...
16.6K
RNA Polymerase II Accessory Proteins
9.4K
Proteins that regulate transcription can do so either via direct contact with RNA Polymerase or through indirect interactions facilitated by adaptors, mediators, histone-modifying proteins, and nucleosome remodelers. Direct interactions to activate transcription is seen in bacteria as well as in some eukaryotic genes. In these cases, upstream activation sequences are adjacent to the promoters, and the activator proteins interact directly with the transcriptional machinery. For example, in...
9.4K
Combinatorial Gene Control
8.4K
Combinatorial gene control is the synergistic action of several transcriptional factors to regulate the expression of a single gene. The absence of one or more of these factors may lead to a significant difference in the level of gene expression or repression.
The expression of more than 30,000 genes is controlled by approximately 2000-3000 transcription factors. This is possible because a single transcription factor can recognize more than one regulatory sequence. The specificity in gene...
The expression of more than 30,000 genes is controlled by approximately 2000-3000 transcription factors. This is possible because a single transcription factor can recognize more than one regulatory sequence. The specificity in gene...
8.4K
Covalently Linked Protein Regulators
7.1K
Proteins can undergo many types of post-translational modifications, often in response to changes in their environment. These modifications play an important role in the function and stability of these proteins. Covalently linked molecules include functional groups, such as methyl, acetyl, and phosphate groups, and also small proteins, such as ubiquitin. There are around 200 different types of covalent regulators that have been identified.
These groups modify specific amino acids in a protein....
These groups modify specific amino acids in a protein....
7.1K


